If a:b = 2:4 and b:c = 4:8, then a:b:c = ? MCQ with Answer and Explanation

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If a:b = 2:4 and b:c = 4:8, then a:b:c = ?

A. 2:5:8

B. 2:4:8

C. 4:8:16

D. 1:4:9

Answer: Option B

Solution (By JKSSB Mock Tests)

Combine ratios: a:b = 2:4, b:c = 4:8 ⇒ a:b:c = 2:4:8.

This question belongs to: Maths Ratio and Proportion

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Practice More Ratio and Proportion Questions

Question #1

Find the mean proportional between 28 and 49.

A. 77

B. 40

C. 37

D. 74

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Correct Answer: Option C

Explanation:
Mean proportional = √(28 × 49) = √(1372) = 37.

This question belongs to: Maths Ratio and Proportion

Question #2

Two numbers are in the ratio 10:4 and their sum is 482. Find the numbers.

A. 680 and 272

B. 323 and 146

C. 357 and 117

D. 340 and 136

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Correct Answer: Option D

Explanation:
Numbers = 10k and 4k. 10k + 4k = 482 ⇒ k = 34. Thus, numbers are 340 and 136.

This question belongs to: Maths Ratio and Proportion

Question #3

Ratio of present ages of A and B is 5:7. After 4 years, the ratio becomes 8:8. Present age of A is?

A. 50 years

B. 90 years

C. 42 years

D. 45 years

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Correct Answer: Option D

Explanation:
Let ages 5k and 7k. Then (5k + 4)/(7k + 4) = 8/8. Solving gives k ≈ 9, age of A = 5*9 = 45.

This question belongs to: Maths Ratio and Proportion

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